Estimate the life of this bearing with 90% reliability.
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- A bearing is subjected to a radial force of 8kN and a thrust force of 3 kN. Thevalues of X and Y factors are 0.56 and 1.5 respectively. The shaft rotates at 1200 RPM. The diameter of the shaft is 75mm and Bearing no. 6315 (C= 112000N) is selected for this application. Estimate the life of this bearing with 90% reliability.A bearing is subjected to a radial force of 8kN and a thrust force of 3 kN. Thevalues of X and Y factors are 0.56 and 1.5 respectively. The shaft rotates at 1200RPM. The diameter of the shaft is 75mm and Bearing no. 6315 (C= 112000N) isselected for this application. Estimate the life of this bearing with 90% reliability. Show the given, required, schematic diagram and solution. Also show the formulas being use.Q2 / A shaft transmitting 15kW at 200r.p.m. are supported by two bearings placed 1 m apart. A 600 mm diameter pulley is mounted at a distance of 300 mm to the right of left hand bearing and this drives a pulley directly below it with the help of belt having maximum tension of 2.25kN. Another pulley 400 mm diameter is placed 200 mm to the left of right hand bearing and is driven with the help of electric motor and belt having maximum tension of 3.376kN, which is placed horizontally to the right. The angle of contact for both the pulleys is180° and =0.24. Determine the suitable diameter for a solid shaft if the bending moment acting on the shaft is reversed, allowing working stress of 42MPA in shear for the material of shaft and have yield stress of 400MPA and ultimate stress of 500MP.. And design the keys which support each pulley if the material of the keys is the same for the material of shaft.
- A propeller shaft rotating at constant speed is subjected to variable loads.Ball bearing supporting the shaft are subject to variable radial loads as follows;16KN for 40 percent of the time,2KN for 10 percent of the time,4KN for 20percent of the time and no load for the remaining time of the cycle.The total life expected for bearing is 3×10^6 revolution at a liability of 94 percent.select the bearing by calculating; a)Net dynamic load for the bearing b)load rating of the bearing from the manufacturers catalogueA 6-in-wide polyamide F-1 flat belt is used to connect a 4-in-diameter pulley to drive a larger pulley with an angular velocity ratio of 3. The center-to-center distance is 8 ft. The angular speed of the small pulley is 1850 rev/min as it delivers 2 hp. The service is such that a service factor Ks of 1.25 is appropriate. (a) Find Fc, Fi, F1a, and F2. (b) Find Ha, nfs, and belt length. (c) Find the dip.A shaft is loaded in bending and torsion such that Ma = 62 N · m, Ta = 48 N · m, Mm = 54 N · m, and Tm = 25 N · m. For the shaft, Su = 700 MPa and Sy = 560 MPa, and a fully corrected endurance limit of Se = 210 MPa is assumed. Let Kf = 2.2 and Kfs = 1.8. With a design factor of 2.0 determine the minimum acceptable diameter of the shaft in mm using the DE-Goodman criterion.
- A deep groove ball bearing rotating at 1200 rpm is subjected to radial and an axial force of 2000 N and 1500 N respectively. What will be the basic dynamic capacity of bearing if 1440 million revolutions are the rating life? (Consider radial factor = 0.55, Thrust factor = 2) O 69.45 kN O 54.49 kN O 50.24 N O 46.3 kN3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side. b T T, B d shaft Dimensions are as follows: da 200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm dB dahaft a We analyzed a problem similar to this on Test 01 using static failure theories. Is this strictly correct? Because the shaft is spinning, would not a material particle see a time-varying reversal of the the bending stress as in the R.R. rotating beam test? Would a particle see a reversal of the torsional shear stress? Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress concentrations. Ignore direct shear stress (that due to V). Find the safety factors with respect to fatigue and yielding. Be guided by section 6-14 on combined loading.. The mean diameter of the driving pulley for a vec-belt drive with two belts is 110 mm. The pulley groove angle is 40° and the drive transmits 4.4 kW at a speed of rotation of 1500 rev/min. The coefficient of frietion between belt and pulley 0.32, and the angle of lap is 160°. Determine the driving torque and the maximum stress in the belt material if the cross-sectional area of each belt is 120 mm.
- A spur gear is mounted on a 28mm shaft at equal distances from two supporting bearing.The gear pitch circle is 7in and its pressure angle o = 15°. Its gearbox transmit 15kW.The shaft and gear turns together with an angular velocity of 30 rad/s. Select the most suitable bearing and calculate its bearing life in hours if dynamic load capacity is equivalent to 22kN.The disc clutch of an automobile is carried on a 2-inch 6-splined shaft and not to slide under load. The nominal dimensions are as follows: b = 0.25 D; t = 0.075 D and d = 0.85 D. The hub length of 150 % of shaft diameter. Determine the total horsepower transmitted at 3,600 rpm, if the yield strength of the shaft is 1,400 psiA shaft is loaded in bending and torsion such that M₁ = 600 lbf in, T, = 400 lbf in, M. 500 lbf in, and T = 300 lbf in. For the shaft, Su 100 kpsi and S, = 80 kpsi, and a fully corrected endurance limit of S, 30 kpsi is assumed. Let Ky = 2.2 and K₁, 1.8. With a design factor of 2.0 determine the minimum acceptable diameter of the shaft using the (a) DE-Gerber criterion. (b) DE-elliptic criterion. (c) DE-Soderberg criterion. (d) DE-Goodman criterion. Discuss and compare the results. www =